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GfPanStip

ABSTRACT: Panellus stipticus (bitter oysterling)

PROVIDER: PRJEB77592 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR13382515.fastq.gz	Fastqsanger.gz
	ERR13363480_1.fastq.gz	Fastqsanger.gz
	ERR13363480_2.fastq.gz	Fastqsanger.gz

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gfPanStip

Project description:Panellus stipticus (bitter oysterling), genomic and transcriptomic data

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Project description:T2R bitter receptors, encoded by Tas2r genes, are not only critical for bitter taste signal transduction but also important for defense against bacteria and parasites. However, little is known about whether and how Tas2r gene expression are regulated. Here, using single-cell assays for transposase-accessible chromatin with sequencing (scATAC-seq), we found that the chromatin accessibility of Tas2rs was highly cell type specific and lipopolysaccharide (LPS)-induced inflammation increased the accessibility of many Tas2rs. scATAC-seq also revealed substantial chromatin remodeling in immune response genes in taste tissue stem cells, suggesting potential long-term effects. Together, our results suggest an epigenetic mechanism connecting inflammation, Tas2r gene regulation, and altered bitter taste, which may explain heightened bitter taste that can occur with infections and cancer treatments.

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Project description:Fruit taste is determined by sugars, acids and in some species, bitter chemicals. Attraction of seed-dispersing organisms in nature and breeding for consumer preferences requires reduced fruit bitterness. A key metabolic shift during ripening prevents tomato fruit bitterness by eliminating α-tomatine, a renowned defence-associated Solanum alkaloid. Here, we combined fine mapping with information from 150 re-sequenced genomes and genotyping a 650 tomato core collection to identify nine bitter-tasting accessions including the ‘high α-tomatine’ Peruvian landraces reported by Rick and colleagues (1994). These ‘bitter’ accessions contain a deletion in GORKY, a nitrate/peptide family (NPF) transporter mediating α-tomatine subcellular localization during fruit ripening. GORKY exports α-tomatine and its derivatives from the vacuole to the cytosol and this facilitates the conversion of the entire α-tomatine pool to non-bitter forms, rendering the fruit palatable. Hence, GORKY activity was a significant innovation in the process of tomato fruit domestication and breeding. The experiment was carried out to further prove that GORKY is localized to tonoplast in ripe fruit.

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